<template>
  <div class="score-case">
    <div class="table">
      <table>
        <thead>
          <tr>
            <th>编号</th>
            <th>科目</th>
            <th>成绩</th>
            <th>考试时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item, index ) in list" :key="(item, id)">
            <td>{{index+1}}</td>
            <td>{{item.subject}}</td>
            <td :class="item.score<60? 'red': '' ">{{item.score}}</td>
            <td>{{formatDate(item.date)}}</td>
            <td><a href="#" @click.prevent="delFn(item.id)">删除</a></td>
          </tr>
          <!-- <tr >
            <td>2</td>
            <td>数学</td>
            <td>100</td>
            <td>Tue Jun 07 2022 10:00:00 GMT+0800 (中国标准时间)</td>
            <td><a href="#">删除</a></td>
          </tr> -->
        </tbody>
        <!-- <tbody >
          <tr>
            <td colspan="5">
              <span class="none">暂无数据</span>
            </td>
          </tr>
        </tbody> -->
        <tfoot>
          <tr>
            <td colspan="5">
              <span>总分：{{sumscore}}</span>
              <span style="margin-left:50px">平均分：{{svgscore}}</span>
            </td>
          </tr>
        </tfoot>
      </table>
    </div>
    <div class="form">
      <div class="form-item">
        <div class="label">科目：</div>
        <div class="input">
          <input v-model.trim='subject' type="text" placeholder="请输入科目" />
        </div>
      </div>
      <div class="form-item">
        <div class="label">分数：</div>
        <div class="input">
          <input v-model.number='score' type="text" placeholder="请输入分数" />
        </div>
      </div>
      <div class="form-item">
        <div class="label"></div>
        <div class="input">
          <button class="submit" @click='submitFn' >添加</button>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import moment from "moment"
export default {
  name: 'ScoreCase',
  data () {
    return {
      list:JSON.parse(localStorage.getItem('score-case')) || [],
      subject: '',
      score: ''
    }
  },
  methods: {
    delFn(id){
     this.list= this.list.filter(item => item.id!==id)
    },
    submitFn(){
      // 判断年龄在0-100之间
      if(this.subject &&(this.score > 0 && this.score <=100)){
        this.list.push({
        // 提交
          id:  this.list.length?this.list.length+1:0 ,
          subject:this.subject,
          score: this.score,
          date: new Date
        }),
        this.subject=''
        this.score=''
      }else{
      alert('输入不正确');
        
      }
    },
    // 格式化时间
    formatDate(input){
      return moment(input).format('YYYY-MM-DD HH:mm:ss')
    }
  },
  computed: {
    sumscore(){
      return this.list.reduce((sum,item) =>sum+item.score,0)
    },
    svgscore(){
      return this.list.length?(this.sumscore/this.list.length).toFixed(2) : 0
    }
  },
  width: {
    deep: true,
    handler(){
      // 监听list的变化
      localStorage.setItem('score-case',JSON.stringify(this.list))
    }

  }
};
</script>

<style lang="less">
.score-case {
  width: 1000px;
  margin: 50px auto;
  display: flex;
  .table {
    flex: 4;
    table {
      width: 100%;
      border-spacing: 0;
      border-top: 1px solid #ccc;
      border-left: 1px solid #ccc;
      th {
        background: #f5f5f5;
      }
      tr:hover td {
        background: #f5f5f5;
      }
      td,
      th {
        border-bottom: 1px solid #ccc;
        border-right: 1px solid #ccc;
        text-align: center;
        padding: 10px;
        &.red {
          color: red;
        }
      }
    }
    .none {
      height: 100px;
      line-height: 100px;
      color: #999;
    }
  }
  .form {
    flex: 1;
    padding: 20px;
    .form-item {
      display: flex;
      margin-bottom: 20px;
      align-items: center;
    }
    .form-item .label {
      width: 60px;
      text-align: right;
      font-size: 14px;
    }
    .form-item .input {
      flex: 1;
    }
    .form-item input,
    .form-item select {
      appearance: none;
      outline: none;
      border: 1px solid #ccc;
      width: 200px;
      height: 40px;
      box-sizing: border-box;
      padding: 10px;
      color: #666;
    }
    .form-item input::placeholder {
      color: #666;
    }
    .form-item .cancel,
    .form-item .submit {
      appearance: none;
      outline: none;
      border: 1px solid #ccc;
      border-radius: 4px;
      padding: 4px 10px;
      margin-right: 10px;
      font-size: 12px;
      background: #ccc;
    }
    .form-item .submit {
      border-color: #069;
      background: #069;
      color: #fff;
    }
  }
}
</style>

